uno.js

var userChoice = prompt("Do you choose rock, paper or scissors?");

var computerChoice = Math.random();

if(computerChoice <= 0.33){
   computerChoice = "rock";
}
else if(computerChoice >= 0.34 && computerChoice <= 0.66){
   computerChoice = "paper";
}
else if(computerChoice >= 0.67){
   computerChoice = "scissors";
}